64749459 has 4 divisors (see below), whose sum is σ = 86332616. Its totient is φ = 43166304.

The previous prime is 64749437. The next prime is 64749463. The reversal of 64749459 is 95494746.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64749459 - 2⁷ = 64749331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64749479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10791574 + ... + 10791579.

It is an arithmetic number, because the mean of its divisors is an integer number (21583154).

Almost surely, 2^64749459 is an apocalyptic number.

64749459 is a deficient number, since it is larger than the sum of its proper divisors (21583157).

64749459 is a wasteful number, since it uses less digits than its factorization.

64749459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21583156.

The product of its digits is 1088640, while the sum is 48.

The square root of 64749459 is about 8046.7048535410. The cubic root of 64749459 is about 401.5553175468. Note that the first 3 decimals are identical.

The spelling of 64749459 in words is "sixty-four million, seven hundred forty-nine thousand, four hundred fifty-nine".